Low Performance Catalytic Converter DTC
On my 01 Park Avenue the Service Engine Soon light came on. Tested it and code P0420 Catalyst Effiency Low. My mechanic cleared the code it lasted for a little while because he said he has had a few GM'* that have popped up with this code when nothing was wrong. It came back about 2 weeks later. His car is due for smog next year. He wanted to know if the code is cleared before the test will the car still fail? I think it will but I don't want to look like an idiot.